Swing/TexturePaint のバックアップの現在との差分(No.10)

TexturePaintを使って背景に画像を表示

概要

#screenshot

サンプルコード

#spanend
 URL url = getClass().getResource("16x16.png");
 BufferedImage img = null;
 try {
   img = ImageIO.read(url);
 }catch(IOException ioe) {
   ioe.printStackTrace();
 }
 Rectangle2D r2d = new Rectangle2D.Double(0,0,img.getWidth(),img.getHeight());
 texture = new TexturePaint(img, r2d);
#spandel

#spanend
 public void paintComponent(Graphics g) {
   Graphics2D g2 = (Graphics2D)g;
   g2.setPaint(texture);
   g2.fillRect(0, 0, getWidth(), getHeight());
   super.paintComponent(g);
 }
#spanadd
* サンプルコード [#sourcecode]
#spanend
#spanadd
#code(link){{
#spanend
#spanadd
String path = "example/16x16.png";
#spanend
#spanadd
ClassLoader cl = Thread.currentThread().getContextClassLoader();
#spanend
#spanadd
BufferedImage bi = Optional.ofNullable(cl.getResource(path)).map(url -> {
#spanend
  try (InputStream s = url.openStream()) {
    return ImageIO.read(s);
  } catch (IOException ex) {
    ex.printStackTrace();
    return makeMissingImage();
  }
#spanadd
}).orElseGet(MainPanel::makeMissingImage);
#spanend
#spanadd
texture = new TexturePaint(bi, new Rectangle(bi.getWidth(), bi.getHeight()));
#spanend
#spanadd
panel = new JPanel() {
#spanend
  @Override protected void paintComponent(Graphics g) {
    Graphics2D g2 = (Graphics2D) g.create();
    g2.setPaint(texture);
    g2.fillRect(0, 0, getWidth(), getHeight());
    g2.dispose();
    super.paintComponent(g);
  }
#spanadd
}
#spanend

• &jnlp;
• &jar;
• &zip;

• BufferedImageを生成
• このImageをGraphics#drawImage(...)で描画するのではなく、TexturePaintを作成しGraphics2D#setPaintメソッドで設定してパネル全体の塗りつぶしを実行

• JPanelの背景に画像を並べる

参考リンク

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